Study on the Weldability of Ni Base Superally (Part 8)

Main Cause of Weld Crackings in Cast Ni Base Superalloy B-1900

Abstract

Up to this time, the authors studied the weld cracking phenomena in typical and fundamental cast Ni-base superalloy, Inconel 713C, to get information on the weld cracking phenomena of cast Ni-base superalloys.
It is the purpose of this study to clarify the main cause of weld cracks in cast Ni-base superalloy, B-1900 which has more excellent mechanical properties than those of Inconel 713C, according to the information about hot cracking phenomena in Inconel 713C.
From experimental results, it was made clear that weld cracks in B-1900 were hot cracks and the main cause of hot cracks was low melting point-fine white constituents crystallized at grain boundaries.